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Finding the Fourth Proportional to 830.45, 1,246.45 and 419.88

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Solution

The fourth proportional to 830.45, 1,246.45 and 419.88 is: 630.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.45 : 1,246.45 = 419.88 : x
  2. Step 2: Convert to fraction form
    830.45/1,246.45 = 419.88/x
  3. Step 3: Cross multiply
    830.45x = 1,246.45 × 419.88
  4. Step 4: Simplify right side
    830.45x = 523,359.43
  5. Step 5: Solve for x
    x = 523,359.43/830.45
  6. Step 6: Final answer
    x = 630.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.